Dripless dispenser for liquids and viscous fluids
US4678107A · kind A · utility
43Cited by
8References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 2, 1985 |
| Grant date | Jul 7, 1987 |
| Priority date | — |
| Expiry date | Aug 2, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05C17/014
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A dispenser for liquids and viscous fluids has a syringe-like device with a barrel for containing fluid and a nozzle at one end. The plunger is movable axially in the barrel for discharging the fluid. At the inner end of the plunger is a flexible, elastic cap which has an end wall that is normally concave, but which is flattened out under pressure when the fluid is discharged. When pressure on the cap is removed, the cap reassumes its concave shape thereby creating a suction in the barrel which draws fluid back into the nozzle to prevent dripping.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.